OPAP - Anti-pollution stoppersOPAP - Anti-pollution stoppers

OPAP - Anti-pollution stoppers

Because Pronal is concerned in environmental protection, we have developed a range of stoppers to contain any accidental pollution that could be released following an incident.

Pronal anti-pollution stoppers are permanently installed inside the pipes. These patented systems are mounted on the upper section of the pipe and do not hinder the water flow. An inflation hose connects the pneumatic OPAP stoppers to a control unit which is located near the inspection well. The stoppers can be inflated by manually using the control unit or by using a remote electric control.

Installing the system is simple and does not require any major civil engineering work. Not only can the stopper be inflated by using the control unit, but it can also be remotely deflated without having to enter the pipe. These stoppers can be used for all pipes ranging in diameter from 100 to 1000 mm.

The stopper system is deployed in the context of risk prevention. Article 13 of the Decree from 5/08/2002 which concerns the prevention of corporate accidents requires establishments to equip their waste-water and rainwater collection networks with stopper systems capable of containing any accidental pollution.

Stoppers are protected by a polyethylene bag prior to being inflated.



  • Excellent chemical compatibility
  • Rapid inflation (manually or automatic)


  • Complies with Article 13 of the Decree published on the 5/08/2002 concerning the prevention of corporate accidents
  • Environmental protection


  • Requires no major civil engineering work
  • Rapid and economical installation

Detailed information

  • Material: NBR/NPVC rubber
  • Technique: vulcanization
  • Length when deflated: 550>2050 mm
  • Diameter: 150 > 1000 mm
  • Tailor-made dimensions possible; contact us
  • Inflation: by air
  • Temperature resistance: -25°C à +85°C
  • Inflation pressure: max. 1.2 bar
  • Accessory: 1 x 1/4″ or 3/4″ valve (when greater than 600 mm)
  • Manual or Remote red painted steel control unit

Technical informations

Ref. Stopper diameter (mm) Width when deflated (mm) Length when deflated (mm) Service pressure (bar) Inflation insert (")
OPAP 100 100 150 450 1.2 1/4"
OPAP 150 150 230 550 1.2 1/4"
OPAP 200 200 300 550 1.2 1/4"
OPAP 250 250 380 600 1.2 1/4"
OPAP 300 300 450 700 1.2 1/4''
OPAP 400 400 600 800 1.2 1/4"
OPAP 500 500 750 1000 1.2 1/4"
OPAP 600 600 900 1200 1 1/4"
OPAP 700 700 1050 1400 0.8 3/4"
OPAP 800 800 1200 1600 0.6 3/4"
OPAP 1000 1000 1550 2050 0.4 3/4"

You can not find your dimensions

Our design department employs the best project leaders and designers and will be pleased to develop and create a tailor-made product specially for your unique project.


Composition / Advice

Pre-installation tips
The pipes must be clean and dry. Constructing a concrete slab for the control unit. Sheath passage with a wire guide. Unobstructed access to pipes. Area cleared for the installation and a 220V power supply near the installation zone.
Maintenance tips
Regularly inspect the condition of the pipe and check the OPAP device annually. Ensure that the cover is removed before visually inspecting the device or performing an inflation test. Ensure that the cover is still intact if the stopper has been deployed in an emergency situation; replace it if it is torn.

Standards / regulations

1 year against all manufacturing defects


Fact Sheets / Business Guides
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Control unit (manual or remote)
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